Changeset 227 in xtideuniversalbios for trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

Timestamp:

Jan 29, 2012, 1:33:44 PM (13 years ago)

Author:

aitotat@…

google:author:

aitotat@gmail.com

Message:

Changes to XTIDE Universal BIOS:

• EBIOS functions now work in lite mode.

File:

• trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm (modified) (3 diffs)

trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm

@@ -78 +78 @@
 ;       CS:BP:  Ptr to IDEVARS for the controller
 ;   Returns:
-;       DX:AX or AX:    Number of cylinders
-;       BH:             Number of sectors per track
-;       BL:             Number of heads
-;   Corrupts registers:
-;       CX, (DX)
+;       Nothing
+;   Corrupts registers:
+;       AX, BX, CX, DX
 ;--------------------------------------------------------------------
 .StoreAddressing:
@@ -88 +86 @@
     call    AccessDPT_GetPointerToDRVPARAMStoCSBX
     test    byte [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_USERCHS    ; User specified CHS?
-    jnz     SHORT .StoreUserDefinedCHSaddressing
+    jnz     SHORT .StoreUserDefinedPCHS
 
     ; Check if LBA supported
     call    AtaID_GetPCHStoAXBLBHfromAtaInfoInESSI
     test    BYTE [es:si+ATA1.wCaps+1], A1_wCaps_LBA>>8
-    jz      SHORT .StoreCHSaddressing
+    jz      SHORT .StoreCHSfromAXBHBL       ; Small old drive with CHS addressing only
 
     ; Check if 48-bit LBA supported
@@ -102 +100 @@
     or      BYTE [di+DPT.bFlagsLow], ADDRESSING_MODE_LBA28<<ADDRESSING_MODE_FIELD_POSITION
     call    AtaID_GetTotalSectorCountToBXDXAXfromAtaInfoInESSI
+    mov     [di+DPT.twLbaSectors], ax
+    mov     [di+DPT.twLbaSectors+2], dx
+    mov     [di+DPT.twLbaSectors+4], bx
     call    AtaID_GetLbaAssistedCHStoDXAXBLBH
-    jmp     SHORT .StoreChsFromDXAXBX
-
-    ; Check if P-CHS to L-CHS translation required
-.StoreUserDefinedCHSaddressing:
+    mov     [di+DPT.bLbaHeads], bl
+    jmp     SHORT .StoreBlockMode
+
+;--------------------------------------------------------------------
+; .StoreUserDefinedPCHS
+;   Parameters:
+;       DS:DI:  Ptr to Disk Parameter Table
+;       ES:SI:  Ptr to 512-byte ATA information read from the drive
+;       CS:BP:  Ptr to IDEVARS for the controller
+;   Returns:
+;       AX:     Number of P-CHS cylinders
+;       BH:     Number of P-CHS sectors per track
+;       BL:     Number of P-CHS heads
+;   Corrupts registers:
+;       Nothing
+;--------------------------------------------------------------------
+.StoreUserDefinedPCHS:
     call    AccessDPT_GetPointerToDRVPARAMStoCSBX
     mov     ax, [cs:bx+DRVPARAMS.wCylinders]
     mov     bx, [cs:bx+DRVPARAMS.wHeadsAndSectors]
-.StoreCHSaddressing:
-    cmp     ax, MAX_LCHS_CYLINDERS
-    jbe     SHORT .StoreChsFromAXBX     ; No translation required
-
-    ; We need to get number of bits to shift for translation
+    ; Fall to .StoreCHSfromAXBHBL
+
+;--------------------------------------------------------------------
+; .StoreCHSfromAXBHBL
+;   Parameters:
+;       AX:     Number of P-CHS cylinders
+;       BH:     Number of P-CHS sectors per track
+;       BL:     Number of P-CHS heads
+;       DS:DI:  Ptr to Disk Parameter Table
+;       ES:SI:  Ptr to 512-byte ATA information read from the drive
+;       CS:BP:  Ptr to IDEVARS for the controller
+;   Returns:
+;       AX:     Number of P-CHS cylinders
+;       BH:     Number of P-CHS sectors per track
+;       BL:     Number of P-CHS heads
+;   Corrupts registers:
+;       CX
+;--------------------------------------------------------------------
+.StoreCHSfromAXBHBL:
     push    ax
-    eMOVZX  dx, bl                      ; Heads now in DX
-    xchg    bx, ax                      ; Cylinders now in BX
-    call    AccessDPT_ShiftPCHinBXDXtoLCH   ; Leaves AX untouched
-    xchg    bx, ax                      ; Restore HeadsAndSectors to BX
+    push    bx
+    call    AccessDPT_ShiftPCHinAXBLtoLCH   ; Get number of bits to shift
+    pop     bx
+    pop     ax
+    jcxz    .StorePCHSfromAXDX              ; Small drive so use L-CHS addressing
+
+    ; Store P-CHS addressing mode and number of bits to shift in L-CHS to P-CHS translation
     or      cl, ADDRESSING_MODE_PCHS<<ADDRESSING_MODE_FIELD_POSITION
-    or      [di+DPT.bFlagsLow], cl      ; Store bits to shift
-    pop     ax
-    ; Fall to .StoreChsFromAXBX
-
-;--------------------------------------------------------------------
-; .StoreChsFromAXBX
-; .StoreChsFromDXAXBX
-;   Parameters:
-;       DX:AX or AX:    Number of cylinders
-;       BH:     Number of sectors per track
-;       BL:     Number of heads
-;       DS:DI:  Ptr to Disk Parameter Table
-;       ES:SI:  Ptr to 512-byte ATA information read from the drive
-;       CS:BP:  Ptr to IDEVARS for the controller
-;   Returns:
-;       Nothing
-;   Corrupts registers:
-;       DX
-;--------------------------------------------------------------------
-.StoreChsFromAXBX:
-    xor     dx, dx
-.StoreChsFromDXAXBX:
-    mov     [di+DPT.dwCylinders], ax
-    mov     [di+DPT.dwCylinders+2], dx
-    mov     [di+DPT.wHeadsAndSectors], bx
+    or      [di+DPT.bFlagsLow], cl
+    ; Fall to .StoreChsFromAXBLBH
+
+;--------------------------------------------------------------------
+; .StoreChsFromAXBLBH
+;   Parameters:
+;       AX:     Number of P-CHS cylinders
+;       BH:     Number of P-CHS sectors per track
+;       BL:     Number of P-CHS heads
+;       DS:DI:  Ptr to Disk Parameter Table
+;       ES:SI:  Ptr to 512-byte ATA information read from the drive
+;       CS:BP:  Ptr to IDEVARS for the controller
+;   Returns:
+;       Nothing
+;   Corrupts registers:
+;       Nothing
+;--------------------------------------------------------------------
+.StorePCHSfromAXDX:
+    mov     [di+DPT.wPchsCylinders], ax
+    mov     [di+DPT.wPchsHeadsAndSectors], bx
     ; Fall to .StoreBlockMode